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href="/categories/JavaScript%E7%AC%94%E8%AE%B0/">JavaScript笔记</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span data-flag-title="JavaScript 第四天"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="twikoo_visitors"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h3 id="JavaScript-基础第四天-—-函数-作用域-作用域链"><a href="#JavaScript-基础第四天-—-函数-作用域-作用域链" class="headerlink" title="JavaScript 基础第四天 — 函数 作用域 作用域链"></a>JavaScript 基础第四天 — 函数 作用域 作用域链</h3><h3 id="1-函数-function"><a href="#1-函数-function" class="headerlink" title="1. 函数 function"></a>1. 函数 function</h3><ol><li><strong>function 执行特定任务的代码块</strong></li><li>可实现代码复用, 提高开发效率</li><li>函数和循环区别: <strong>随时调用, 随时执行, 可重复调用</strong></li><li>函数可把相同逻辑代码包裹起来, 通过函数调用执行包裹的代码, <strong>有利精简代码方便复用</strong></li><li>和变量命名基本一致, 使用小驼峰命名法, <strong>前缀应为动词</strong></li></ol><h5 id="1-函数声明语法"><a href="#1-函数声明语法" class="headerlink" title="1. 函数声明语法"></a>1. 函数声明语法</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> 函数名 &#123;</span><br><span class="line">    函数体</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h5 id="2-函数调用与使用"><a href="#2-函数调用与使用" class="headerlink" title="2. 函数调用与使用"></a>2. 函数调用与使用</h5><ol><li>函数不调用 自己不执行, 使用()调用函数</li><li>曾使用的alert()、parseInt()后面跟小括号的本质都是函数的调用<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 函数一次声明可多次调用 每一次调用函数 代码都会重新执行一次</span></span><br><span class="line"><span class="title function_">say</span>()</span><br><span class="line"><span class="title function_">say</span>()</span><br></pre></td></tr></table></figure></li><li>循环代码写完即执行，不能方便控制执行位置</li><li>函数体是函数的构成部分, 它负责把代码包裹起来, 直到函数调用时函数体代码才会执行</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params"></span>) &#123; <span class="comment">// say是函数名</span></span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;你好&#x27;</span>) <span class="comment">// 函数体</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">say</span>() <span class="comment">// 调用函数</span></span><br></pre></td></tr></table></figure><h5 id="3-99乘法表封装到函数里-调用1次"><a href="#3-99乘法表封装到函数里-调用1次" class="headerlink" title="3. 99乘法表封装到函数里, 调用1次"></a>3. 99乘法表封装到函数里, 调用1次</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> num1 = <span class="number">1</span>; num1 &lt;= <span class="number">9</span>; num1++) &#123;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">let</span> num2 = <span class="number">1</span>; num2 &lt;= num1; num2++) &#123;</span><br><span class="line">            <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="string">`<span class="subst">$&#123;num2&#125;</span> x <span class="subst">$&#123;num1&#125;</span> = <span class="subst">$&#123;num1 * num2&#125;</span>`</span>)</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="string">`&lt;br&gt;`</span>)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">say</span>()</span><br></pre></td></tr></table></figure><h5 id="4-封装一个函数-计算1-100之间的和"><a href="#4-封装一个函数-计算1-100之间的和" class="headerlink" title="4. 封装一个函数, 计算1~100之间的和"></a>4. 封装一个函数, 计算1~100之间的和</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">let</span> num1 = <span class="number">0</span></span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> num2 = <span class="number">1</span>; num2 &lt;= <span class="number">100</span>; num2++) &#123;</span><br><span class="line">        num1 += num2</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(num1)</span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">say</span>()</span><br></pre></td></tr></table></figure><hr><h3 id="2-函数传参"><a href="#2-函数传参" class="headerlink" title="2. 函数传参"></a>2. 函数传参</h3><ol><li>若函数完成功能需调用者传入数据, 就需用函数传参</li><li>调用函数时, 传几个数据就写几个, 用逗号隔开</li><li>提高函数灵活性, 函数分为<strong>形参和实参</strong></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params">num1, num2</span>) &#123; <span class="comment">// () 参数列表</span></span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(num1 + num2)</span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">say</span>(<span class="number">1</span>, <span class="number">100</span>) <span class="comment">// () 传递的参数列表 , 隔开</span></span><br></pre></td></tr></table></figure><h4 id="1-形参和实参"><a href="#1-形参和实参" class="headerlink" title="1. 形参和实参"></a>1. 形参和实参</h4><ol><li>形参: 声明函数时写在函数名右括号叫形参 (形式上参数)</li><li>实参: 调用函数时写在函数名右括号叫实参 (实际上参数)</li><li>形参可理解为<strong>函数内声明变量</strong>，实参可理解<strong>为变量赋值</strong></li><li>开发中需保持形参和实参个数一致</li><li>曾使用过alert, parseInt, number本质上都是函数调用传参</li></ol><h5 id="2-函数封装求和"><a href="#2-函数封装求和" class="headerlink" title="2. 函数封装求和"></a>2. 函数封装求和</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 利用逻辑中断 形参不赋值, 则是undefined</span></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params">num1, num2</span>) &#123;</span><br><span class="line">    num1 = num1 || <span class="number">0</span></span><br><span class="line">    num2 = num2 || <span class="number">0</span></span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(num1 + num2)</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// say(1, 2)</span></span><br><span class="line"><span class="comment">// say()</span></span><br></pre></td></tr></table></figure><h5 id="3-函数封装求学生总分"><a href="#3-函数封装求学生总分" class="headerlink" title="3. 函数封装求学生总分"></a>3. 函数封装求学生总分</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params">num1</span>) &#123;</span><br><span class="line">    <span class="keyword">let</span> num2 = <span class="number">0</span></span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> num3 = <span class="number">0</span>; num3 &lt; num1.<span class="property">length</span>; num3++) &#123;</span><br><span class="line">        num2 += num2[num3]</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(num2)</span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">say</span>([<span class="number">11</span>, <span class="number">22</span>, <span class="number">33</span>])</span><br><span class="line"><span class="title function_">say</span>([<span class="number">10</span>, <span class="number">20</span>, <span class="number">30</span>])</span><br></pre></td></tr></table></figure><h3 id="3-函数返回值"><a href="#3-函数返回值" class="headerlink" title="3. 函数返回值"></a>3. 函数返回值</h3><ol><li>函数缺点: 把计算结果处理写死了, 内部处理了</li><li>当调用函数, 函数会返回结果, 这就是有返回值的函数</li><li>函数执行后得到结果，结果是调用者要拿到的</li><li>很多函数具备返回值(prompt, parseInt)</li><li>这些函数是JS底层内置的, 直接可使用, 有的函数, 没有返回值, 根据需求, 来设定返回值</li></ol><h4 id="1-return返回数据"><a href="#1-return返回数据" class="headerlink" title="1. return返回数据:"></a>1. return返回数据:</h4><ol><li>函数需返回数据时, 用return 来返回值</li><li>return会立即结束当前函数, 将内部结果交给函数外使用</li><li><strong>函数内只能1次return, 并且return后面代码不会被执行, 所以return后面数据不要换行写</strong></li><li>函数可以没有return, 这种情况函数默认返回值为undefined</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params"></span>) &#123;</span><br><span class="line">  <span class="comment">// return 10 相当于 say() = 10</span></span><br><span class="line">    <span class="keyword">return</span> <span class="number">10</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">say</span>()</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title function_">say</span>())</span><br></pre></td></tr></table></figure><ol><li>求任意数组中最大值 并返回最大值</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params">num1</span>) &#123;</span><br><span class="line">    <span class="keyword">let</span> num2 = num1[<span class="number">0</span>]</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> num3 = <span class="number">0</span>; num3 &lt; num1.<span class="property">length</span>; num3++) &#123;</span><br><span class="line">        <span class="keyword">if</span> (num2 &lt; num1[num3]) &#123;</span><br><span class="line">            num2 = num1[num3]</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"><span class="keyword">return</span> num2</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">let</span> re = <span class="title function_">say</span>([<span class="number">11</span>, <span class="number">22</span>, <span class="number">33</span>])</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(re)</span><br></pre></td></tr></table></figure><ol start="3"><li>求任意2个数的最大值 并返回</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">say</span>(<span class="params">num1, num2</span>) &#123;</span><br><span class="line">    <span class="keyword">if</span> (num11 &gt; num2) &#123;</span><br><span class="line">        <span class="keyword">return</span> num1</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> num2</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title function_">say</span>(<span class="number">11</span>, <span class="number">22</span>))</span><br></pre></td></tr></table></figure><h3 id="4-作用域"><a href="#4-作用域" class="headerlink" title="4. 作用域"></a>4. 作用域</h3><ol><li>作用域的使用提高逻辑局部性, 增强程序可靠性，减少名字冲突</li><li>代码中用到的名字并不总有效可用, 而限定名字可用性代码范围叫作用域</li></ol><ul><li>全局作用域: 函数外部或整个Script 有效</li><li>局部作用域: 函数内部有效, 也叫函数作用域</li><li>块级作用域: { }内有效, if和for里的{ } 等…</li></ul><h4 id="1-变量作用域"><a href="#1-变量作用域" class="headerlink" title="1. 变量作用域"></a>1. 变量作用域</h4><ol><li>全局变量: 函数外部let的变量–<strong>任何区域都可访问修改</strong></li><li>局部变量: 函数内部let的变量–局部变量<strong>只能在当前函数内部访问修改</strong></li><li>块级变量: {}内部let变量–<strong>只能在块作用域访问</strong>, 不能跨块、跨函数访问</li></ol><h5 id="2-变量作用域两个坑-特殊情况"><a href="#2-变量作用域两个坑-特殊情况" class="headerlink" title="2. 变量作用域两个坑, 特殊情况"></a>2. 变量作用域两个坑, 特殊情况</h5><ol><li>函数内部或块作用域内部, 变量没声明直接赋值, 也当全局变量看, 不推荐</li><li>函数内部形参可看做局部变量</li></ol><h3 id="5-作用域链"><a href="#5-作用域链" class="headerlink" title="5. 作用域链"></a>5. 作用域链</h3><ol><li><p>作用域链：采取就近原则方式来查找变量最终值</p></li><li><p>只要是代码, 至少有一个作用域</p></li><li><p>函数中还有函数, 那这个作用域又可诞生一个作用域</p></li><li><p>根据内部函数可访问外部函数变量机制, 用链式查找决定数据能被内部函数访问叫 作用域链</p></li><li><p>下面最终结果是几？</p></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">let</span> num1 = <span class="number">123</span></span><br><span class="line">    <span class="keyword">function</span> <span class="title function_">f2</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="variable language_">console</span>.<span class="title function_">log</span>(num1)</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="title function_">f2</span>()</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">let</span> num1 = <span class="number">456</span></span><br><span class="line"><span class="title function_">fn</span>()</span><br></pre></td></tr></table></figure><ol start="2"><li>下面最终结果是几？</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> a = <span class="number">1</span></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fn1</span>(<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">let</span> a = <span class="number">1</span></span><br><span class="line">    <span class="keyword">let</span> b = <span class="string">&#x27;22&#x27;</span></span><br><span class="line">    <span class="title function_">fn2</span>()</span><br><span class="line">    <span class="keyword">function</span> <span class="title function_">fn2</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="keyword">let</span> a = <span class="number">2</span></span><br><span class="line">        <span class="title function_">fn3</span>()</span><br><span class="line">        <span class="keyword">function</span> <span class="title function_">fn3</span>(<span class="params"></span>) &#123;</span><br><span class="line">            <span class="keyword">let</span> a = <span class="number">3</span></span><br><span class="line">            <span class="variable language_">console</span>.<span class="title function_">log</span>(a) <span class="comment">//a的值 ?</span></span><br><span class="line">            <span class="variable language_">console</span>.<span class="title function_">log</span>(b) <span class="comment">//b的值 ?</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">fn1</span>()</span><br></pre></td></tr></table></figure><h3 id="6-匿名函数"><a href="#6-匿名函数" class="headerlink" title="6. 匿名函数"></a>6. 匿名函数</h3><ol><li>将函数赋值给变量, 并<strong>通过变量名调用叫函数表达式</strong></li><li>匿名函数形参和实参使用跟具名函数一样</li><li>函数分为: 具名函数, 匿名函数</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num = <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="number">1</span>)</span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">num</span>()</span><br></pre></td></tr></table></figure><h3 id="7-立即执行函数"><a href="#7-立即执行函数" class="headerlink" title="7. 立即执行函数"></a>7. 立即执行函数</h3><ol><li>避免全局变量之间的污染</li><li>无需调用, 立即执行, 本质已调用了</li><li>多个立即执行函数要用 ; 隔开，不然报错</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 第一种写法</span></span><br><span class="line">(<span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="number">1</span>)</span><br><span class="line">&#125;)()</span><br><span class="line"> </span><br><span class="line"><span class="comment">// 第二种写法</span></span><br><span class="line">(<span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="number">2</span>)</span><br><span class="line">&#125;())</span><br></pre></td></tr></table></figure><ol><li>用户输入时间后 转换时间</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = +<span class="title function_">prompt</span>(<span class="string">&#x27;请输入总秒数&#x27;</span>)</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params">num1</span>) &#123;</span><br><span class="line">    <span class="keyword">let</span> h = <span class="built_in">parseInt</span>(num1 / <span class="number">60</span> / <span class="number">60</span> % <span class="number">24</span>)</span><br><span class="line">    <span class="keyword">let</span> m = <span class="built_in">parseInt</span>(num1 / <span class="number">60</span> % <span class="number">60</span>)</span><br><span class="line">    <span class="keyword">let</span> s = <span class="built_in">parseInt</span>(num1 % <span class="number">60</span>)</span><br><span class="line">    h = h &lt; <span class="number">10</span> ? <span class="string">&#x27;0&#x27;</span> + h : h</span><br><span class="line">    m = m &lt; <span class="number">10</span> ? <span class="string">&#x27;0&#x27;</span> + m : m</span><br><span class="line">    s = s &lt; <span class="number">10</span> ? <span class="string">&#x27;0&#x27;</span> + s : s</span><br><span class="line">    <span class="keyword">return</span> <span class="string">`您输入了<span class="subst">$&#123;num1&#125;</span>秒,计算后的时间是<span class="subst">$&#123;h&#125;</span>小时<span class="subst">$&#123;m&#125;</span>分<span class="subst">$&#123;s&#125;</span>秒`</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">let</span> re = <span class="title function_">fn</span>(num1)</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(re)</span><br></pre></td></tr></table></figure><hr><h4 id="本节单词"><a href="#本节单词" class="headerlink" 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.eu.org)就行, 博客写的太乱了, 没时间打理, 兄弟们谅解😁😁~~</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-3"><a class="toc-link" href="#JavaScript-%E5%9F%BA%E7%A1%80%E7%AC%AC%E5%9B%9B%E5%A4%A9-%E2%80%94-%E5%87%BD%E6%95%B0-%E4%BD%9C%E7%94%A8%E5%9F%9F-%E4%BD%9C%E7%94%A8%E5%9F%9F%E9%93%BE"><span class="toc-number">1.</span> <span class="toc-text">JavaScript 基础第四天 — 函数 作用域 作用域链</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-%E5%87%BD%E6%95%B0-function"><span class="toc-number">2.</span> <span class="toc-text">1. 函数 function</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#1-%E5%87%BD%E6%95%B0%E5%A3%B0%E6%98%8E%E8%AF%AD%E6%B3%95"><span class="toc-number">2.0.1.</span> <span class="toc-text">1. 函数声明语法</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#2-%E5%87%BD%E6%95%B0%E8%B0%83%E7%94%A8%E4%B8%8E%E4%BD%BF%E7%94%A8"><span class="toc-number">2.0.2.</span> <span class="toc-text">2. 函数调用与使用</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#3-99%E4%B9%98%E6%B3%95%E8%A1%A8%E5%B0%81%E8%A3%85%E5%88%B0%E5%87%BD%E6%95%B0%E9%87%8C-%E8%B0%83%E7%94%A81%E6%AC%A1"><span class="toc-number">2.0.3.</span> <span class="toc-text">3. 99乘法表封装到函数里, 调用1次</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#4-%E5%B0%81%E8%A3%85%E4%B8%80%E4%B8%AA%E5%87%BD%E6%95%B0-%E8%AE%A1%E7%AE%971-100%E4%B9%8B%E9%97%B4%E7%9A%84%E5%92%8C"><span class="toc-number">2.0.4.</span> <span class="toc-text">4. 封装一个函数, 计算1~100之间的和</span></a></li></ol></li></ol><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E5%87%BD%E6%95%B0%E4%BC%A0%E5%8F%82"><span class="toc-number">3.</span> <span class="toc-text">2. 函数传参</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E5%BD%A2%E5%8F%82%E5%92%8C%E5%AE%9E%E5%8F%82"><span class="toc-number">3.1.</span> <span class="toc-text">1. 形参和实参</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#2-%E5%87%BD%E6%95%B0%E5%B0%81%E8%A3%85%E6%B1%82%E5%92%8C"><span class="toc-number">3.1.1.</span> <span class="toc-text">2. 函数封装求和</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#3-%E5%87%BD%E6%95%B0%E5%B0%81%E8%A3%85%E6%B1%82%E5%AD%A6%E7%94%9F%E6%80%BB%E5%88%86"><span class="toc-number">3.1.2.</span> <span class="toc-text">3. 函数封装求学生总分</span></a></li></ol></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#3-%E5%87%BD%E6%95%B0%E8%BF%94%E5%9B%9E%E5%80%BC"><span class="toc-number">4.</span> <span class="toc-text">3. 函数返回值</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-return%E8%BF%94%E5%9B%9E%E6%95%B0%E6%8D%AE"><span class="toc-number">4.1.</span> <span class="toc-text">1. return返回数据:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#4-%E4%BD%9C%E7%94%A8%E5%9F%9F"><span class="toc-number">5.</span> <span class="toc-text">4. 作用域</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E5%8F%98%E9%87%8F%E4%BD%9C%E7%94%A8%E5%9F%9F"><span class="toc-number">5.1.</span> <span class="toc-text">1. 变量作用域</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#2-%E5%8F%98%E9%87%8F%E4%BD%9C%E7%94%A8%E5%9F%9F%E4%B8%A4%E4%B8%AA%E5%9D%91-%E7%89%B9%E6%AE%8A%E6%83%85%E5%86%B5"><span class="toc-number">5.1.1.</span> <span class="toc-text">2. 变量作用域两个坑, 特殊情况</span></a></li></ol></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#5-%E4%BD%9C%E7%94%A8%E5%9F%9F%E9%93%BE"><span class="toc-number">6.</span> <span class="toc-text">5. 作用域链</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#6-%E5%8C%BF%E5%90%8D%E5%87%BD%E6%95%B0"><span class="toc-number">7.</span> <span class="toc-text">6. 匿名函数</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#7-%E7%AB%8B%E5%8D%B3%E6%89%A7%E8%A1%8C%E5%87%BD%E6%95%B0"><span class="toc-number">8.</span> <span class="toc-text">7. 立即执行函数</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%9C%AC%E8%8A%82%E5%8D%95%E8%AF%8D"><span class="toc-number">8.1.</span> <span class="toc-text">本节单词:</span></a></li></ol></li></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/post/ds2s/" title="整个前端面试题"><img src="https://cdn1.tianli0.top/gh/web-xc/iMG/postss/vue.png" onerror='this.onerror=null,this.src="https://npm.elemecdn.com/webxc@1.0.2/banner/404.gif"' alt="整个前端面试题"></a><div class="content"><a class="title" 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